1. There are a lot of impurities in minerals

Mica flakes containing different impurities can show various colors. According to the different colors, the type of impurities can be judged. Black or green impurities are generally magnetite, which is more harmful; reddish-brown and light brown impurities are hematite and limonite, respectively, which are less harmful. Among these impurities, the conductivity of magnetite is the largest, so the muscovite containing black magnetite impurities can reduce the insulation limit by 2-3 grades. Synthetic mica powder price

2. There are a lot of bubbles on the surface

The air bubbles in the cloudless sheet often contain moisture, and it is difficult to remove by ordinary drying methods, so the loss of the mica sheet increases. Especially at high frequencies, because the ionization of these bubbles is strengthened, the loss increases significantly, and even causes dielectric breakdown. If a capacitor is made of mica sheets containing visible air bubbles, it is likely to become a hidden danger of capacitor failure. In addition, due to the existence of air bubbles, the temperature coefficient of the dielectric constant of the mica sheet can also be increased.

3. Unexpected factors

The ripple on the surface of the mica sheet mainly affects the temperature coefficient of the capacitance, resulting in the instability of the capacitance. Wrinkles and cracks can cause ionization and affect the capacitance; pinholes and sand holes affect the withstand voltage, which can easily lead to ionization and breakdown; red and green wires have little effect under normal conditions, but when the area is too large, it may affect the Long-term pressure and capacity stability.